Optical transmission system, method for analyzing thereof, terminal station device, and management device

A receiving method for a receiving terminal station device of an optical transmission system including an optical add-drop multiplexer that receives a first wavelength multiplexed signal including a first optical signal and a first dummy light from a first terminal station and a second wavelength multiplexed signal including a second optical signal and a second dummy light from a second terminal station, the receiving method comprising:

• demultiplexing an output light transmitted from the optical add-drop multiplexer, the output light includes the first optical signal, at least a part of the first dummy light, the second optical signal, and at least a part of the second dummy light;
• and
• receiving the first optical signal and the second optical signal demultiplexed from the output light,
• wherein a wavelength arrangement of the first dummy light is different form a wavelength arrangement of the second dummy light, and a light spectrum width of the first dummy light is different form a light spectrum width of the second dummy light.

A optical transmission system comprising:

• a first terminal station;
• a second terminal station;
• an optical add-drop multiplexer;
• and
• a receiving terminal station,
• wherein the optical add-drop multiplexer receives a first wavelength multiplexed signal including a first optical signal and a first dummy light from the first terminal station and a second wavelength multiplexed signal including a second optical signal and a second dummy light from the second terminal station, and
• the receiving terminal station device comprising:
• a demultiplexer configured to demultiplex an output light transmitted from the optical add-drop multiplexer, the output light includes the first optical signal, at least a part of the first dummy light, the second optical signal, and at least a part of the second dummy light;
• and
• a receiver configured to receive the first optical signal and the second optical signal demultiplexed from the output light,
• wherein a wavelength arrangement of the first dummy light is different form a wavelength arrangement of the second dummy light, and a light spectrum width of the first dummy light is different form a light spectrum width of the second dummy light.